package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * @author 军哥
 * @version 1.0
 * @description: TODO
 * @date 2025/4/22 13:20
 */

@Configuration
@Order(1)
public class MyGlobalFilter implements GlobalFilter {

    @Autowired
    StringRedisTemplate stringRedisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //--1 获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath();
        System.out.println("请求路径："+url);

        //--2 白名单
        // 登录接口/注册接口/发送验证码
        if(url.contains("/adminLogin")) {
            System.out.println("登录接口白名单：" + url);
            return chain.filter(exchange);
        }
        if(url.contains("/userReg")) {
            System.out.println("注册接口白名单：" + url);
            return chain.filter(exchange);
        }
        if(url.contains("/sendCode")) {
            System.out.println("发送验证码接口白名单：" + url);
            return chain.filter(exchange);
        }
        if(url.contains("/shopperLogin")) {
            System.out.println("商户登录接口白名单：" + url);
            return chain.filter(exchange);
        }

        //-- 检查并验证token

        // 获取请求头中的token
        String token = request.getHeaders().getFirst("token");
        if(token == null || token.isEmpty()) {
            // token为空，进行拦截，并返回401状态码
            System.out.println("token为空:" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 获取redis中的token
        Claims body = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = body.get("userId", Integer.class);
        String redisKey = "token-" + userId;
        String redisToken = stringRedisTemplate.opsForValue().get(redisKey);
        if(redisToken == null || redisToken.isEmpty()) {
            System.out.println("token已过期:" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 比较两个token
        if(!token.equals(redisToken)) {
            System.out.println("token错误:" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //-- token续期（续期60分钟）
        stringRedisTemplate.expire(redisKey, 60, TimeUnit.MINUTES);

        //-- 放行（转发）
        System.out.println("放行：" + url);

        return chain.filter(exchange);
    }
}
